阅读说明：本技术 一种油气田环保防渗透柔性高压输送管及其工艺方法 (Environment-friendly anti-seepage flexible high-pressure conveying pipe for oil and gas field and process method thereof ) 是由 张春建 李明 于 2019-09-12 设计创作，主要内容包括：本发明涉及一种油气田环保防渗透柔性高压输送管及其工艺方法,一种油气田环保防渗透柔性高压输送管由内到外依次包括内芯层、缠绕层和外保护层,所述内芯层由内到外依次包括防渗层、粘合剂层和外层,所述防渗层为PVDF材质,所述粘合剂层为EVA复合胶,所述外层为聚乙烯树脂。本发明结构简单,有效防止了介质的渗透,防止在输送过程中对土壤造成污染,防止由于介质渗透对外层和外保护层造成腐蚀而影响使用；采用三层共挤工艺,可将防渗层、粘合剂层和外层一体挤出,本产品的渗透率大大低于同类产品；缠绕张力适宜,使本产品具有较好的抗压力效果,同时具有较好的柔性。(The invention relates to an environment-friendly anti-seepage flexible high-pressure conveying pipe for an oil and gas field and a process method thereof. The invention has simple structure, effectively prevents the permeation of the medium, prevents the soil from being polluted in the conveying process, and prevents the use from being influenced by the corrosion of the outer layer and the outer protective layer caused by the permeation of the medium; by adopting a three-layer co-extrusion process, the anti-seepage layer, the adhesive layer and the outer layer can be integrally extruded, and the permeability of the product is greatly lower than that of the like product; the winding tension is appropriate, so that the product has a better pressure resistance effect and better flexibility.)

1. The utility model provides an oil gas field environmental protection prevention of seepage passes through flexible high pressure feed pipe which characterized in that: the composite material sequentially comprises an inner core layer, a winding layer (1) and an outer protection layer (2) from inside to outside, wherein the inner core layer sequentially comprises an impermeable layer (3), an adhesive layer (4) and an outer layer (5) from inside to outside, the impermeable layer (3) is made of PVDF, the adhesive layer (4) is EVA (ethylene vinyl acetate) composite adhesive, and the outer layer (5) is polyethylene resin.

2. The oil and gas field environment-friendly anti-seepage flexible high-pressure delivery pipe according to claim 1, characterized in that: the winding layer (1) is made of polyester fiber yarns, the winding stroke of the winding layer (1) is 2.2 times of the outer diameter of the inner core layer, and the winding tension of the winding layer (1) is 6 kgf.

3. The oil and gas field environment-friendly anti-seepage flexible high-pressure conveying pipe as claimed in claim 1, wherein the anti-seepage layer (3) is made of raw materials of 95.9 parts of ~.5 parts of PVDF, 1.64 parts of plasticizer and 2.5 parts of heat stabilizer, the outer layer (5) is made of raw materials of 97.3 parts of ~ parts of polyethylene, 1.5 parts of anti-aging agent and 1.5 parts of ~.5 parts of plasticizer, 1.2 parts of plasticizer, and the outer protective layer (2) is made of raw materials of 94.6 parts of ~.5 parts of polyethylene, 2.5 parts of anti-aging agent, 1.2 parts of plasticizer and 1 ~.2 parts of antioxidant.

4. The environment-friendly anti-seepage flexible high-pressure conveying pipe for the oil and gas field as claimed in claim 3, wherein the anti-seepage layer (3) is made of the following raw materials in parts by weight: 95.9 parts of PVDF, 1.1 parts of plasticizer and 3 parts of heat stabilizer; the outer layer (5) is prepared from the following raw materials in parts by weight: 97.3 parts of polyethylene, 1.5 parts of anti-aging agent and 1.2 parts of plasticizer; the outer protection layer (2) is prepared from the following raw materials in parts by weight: 94.6 parts of polyethylene, 3 parts of ageing resistant agent, 1.2 parts of plasticizer and 1.2 parts of antioxidant.

5. The environment-friendly anti-seepage flexible high-pressure conveying pipe for the oil and gas field as claimed in claim 3, wherein the anti-seepage layer (3) is made of the following raw materials in parts by weight: 96.5 parts of PVDF, 1 part of plasticizer and 2.5 parts of heat stabilizer; the outer layer (5) is prepared from the following raw materials in parts by weight: 98 parts of polyethylene, 1 part of an anti-aging agent and 1 part of a plasticizer; the outer protection layer (2) is prepared from the following raw materials in parts by weight: 95.5 parts of polyethylene, 2.5 parts of ageing resistant agent, 1 part of plasticizer and 1 part of antioxidant.

6. The environment-friendly anti-seepage flexible high-pressure conveying pipe for the oil and gas field as claimed in claim 3, wherein the anti-seepage layer (3) is made of the following raw materials in parts by weight: 96.2 parts of PVDF, 1.05 parts of plasticizer and 2.75 parts of heat stabilizer; the outer layer (5) is prepared from the following raw materials in parts by weight: 97.65 parts of polyethylene, 1.25 parts of anti-aging agent and 1.1 parts of plasticizer; the outer protection layer (2) is prepared from the following raw materials in parts by weight: 95.05 parts of polyethylene, 2.75 parts of ageing resistant agent, 1.1 parts of plasticizer and 1.1 parts of antioxidant.

7. A process method of an environment-friendly anti-seepage flexible high-pressure delivery pipe for an oil and gas field is characterized by comprising the following steps:

step one, three extruders share one set of die, the three extruders respectively extrude an impermeable layer, an adhesive layer and an outer layer, and an inner core layer of an integral structure is formed at a die opening through different flow channels in the die;

step two, adopting a vacuum box to fix the wall thickness and diameter of the inner core layer, wherein the vacuum pressure is-0.04 ~ -0.06 MPa;

step three, cooling the inner core layer by using a cooling water tank, wherein the temperature of the cooling water is 17 ~ 23 ℃;

step four, adopting a tractor to draw the inner core layer so as to ensure the continuous extrusion of the inner core layer;

winding the polyester fiber yarn outside the inner core layer by using a winding machine to form a winding layer, wherein the winding stroke is 2.2 times of the outer diameter of the inner core layer, and the winding tension is 6 kgf;

and step six, coating the outer protective layer on the outer surface of the winding layer through a coating machine.

8. The process method of the environment-friendly anti-seepage flexible high-pressure delivery pipe for the oil and gas field according to claim 7, wherein the inner core layer in the first step sequentially comprises an anti-seepage layer, an adhesive layer and an outer layer from inside to outside;

the impermeable layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 9 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 170 +/-3 ℃; and a second zone: 230 +/-3 ℃; and (3) three zones: 270 plus or minus 3 ℃; and (4) four areas: 290 +/-3 ℃; and a fifth zone: 300 +/-3 ℃; a sixth zone: 290 +/-3 ℃; seven areas: 290 +/-3 ℃; and eight regions: 280 plus or minus 3 ℃; nine areas: 260 +/-3 ℃;

the adhesive layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 80 plus or minus 2 ℃; and a second zone: 90 plus or minus 2 ℃; and (3) three zones: 105 +/-2 ℃; and (4) four areas: 110 +/-2 ℃; and a fifth zone: 100 plus or minus 2 ℃; a sixth zone: 95 +/-2 ℃;

the outer layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 160 +/-3 ℃; and a second zone: 175 plus or minus 3 ℃; and (3) three zones: 195 +/-3 ℃; and (4) four areas: 220 +/-3 ℃; and a fifth zone: 200 plus or minus 3 ℃; a sixth zone: 175 +/-3 ℃.

9. The process method of the oil and gas field environment-friendly anti-seepage flexible high-pressure delivery pipe according to claim 7, wherein the traction frequency of the tractor in the fourth step is 45Hz, and the traction speed is 5 m/min.

10. The process method of the environment-friendly anti-seepage flexible high-pressure delivery pipe for the oil and gas field according to claim 7, wherein the outer protection layer in the sixth step is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 180 plus or minus 3 ℃; and a second zone: 190 plus or minus 3 ℃; and (3) three zones: 205 plus or minus 3 ℃; and (4) four areas: 235 plus or minus 3 ℃; and a fifth zone: 220 +/-3 ℃; a sixth zone: 185 +/-3 ℃.

Technical Field

The invention belongs to the technical field of conveying pipelines for oil and gas fields, and particularly relates to an environment-friendly anti-seepage flexible high-pressure conveying pipe for an oil and gas field and a process method thereof.

Background

At present, the conveying pipelines used in oil and gas fields mainly comprise steel pipes, glass reinforced plastic pipes, flexible composite pipes and steel skeleton composite pipes, and the steel pipes are poor in corrosion resistance and the glass reinforced plastic pipes are brittle and easy to break. The conveying pipeline mainly used at the present stage is a flexible composite pipe and a steel skeleton composite pipe. After the use of the two products in recent years, in the use process, because the density of the polyethylene lining layer is low and the gaps among the molecules are large, when crude oil or gas is conveyed, the conveyed medium runs off through the gaps among the molecules and permeates into soil to pollute the soil. The reinforcing layer of the composite pipe is easy to corrode due to permeation of the conveying medium, so that the pressure performance of the product is reduced, the pipe body is gradually broken, and large-area pollution is caused to the land and the environment.

Disclosure of Invention

The invention aims to solve the technical problem of providing an environment-friendly anti-seepage flexible high-pressure conveying pipe for an oil and gas field and a process method thereof, wherein the environment-friendly anti-seepage flexible high-pressure conveying pipe is used for preventing medium from permeating to prevent pollution.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the utility model provides an oil gas field environmental protection prevention of seepage passes through flexible high pressure conveyer pipe, it includes interior sandwich layer, winding layer and outer protective layer by interior to outer in proper order, interior sandwich layer includes barrier layer, adhesive layer and skin by interior to outer in proper order, the barrier layer is the PVDF material, the adhesive layer is the EVA complex and glues, the skin is polyethylene resin.

As a further improvement of the present invention, the winding layer is a polyester fiber yarn, the winding stroke of the winding layer is 2.2 times the outer diameter of the inner core layer, and the winding tension of the winding layer is 6 kgf.

As a further improvement of the invention, the anti-seepage layer is made of the following raw materials, by weight, 95.9 ~ 96.5.5 parts of PVDF, 1 ~ 1.1.1 parts of plasticizer and 2.5 ~ 3 parts of heat stabilizer, the outer layer is made of the following raw materials, by weight, 97.3 ~ 98 parts of polyethylene, 1 ~ 1.5.5 parts of anti-aging agent and 1 ~ 1.2.2 parts of plasticizer, and the outer protective layer is made of the following raw materials, by weight, 94.6 ~ 95.5.5 parts of polyethylene, 2.5 ~ 3 parts of anti-aging agent, 1 ~ 1.2.2 parts of plasticizer and 1 ~ 1.2.2 parts of antioxidant.

As a further improvement of the invention, the impermeable layer is prepared from the following raw materials in parts by weight: 95.9 parts of PVDF, 1.1 parts of plasticizer and 3 parts of heat stabilizer; the outer layer is prepared from the following raw materials in parts by weight: 97.3 parts of polyethylene, 1.5 parts of anti-aging agent and 1.2 parts of plasticizer; the outer protective layer is prepared from the following raw materials in parts by weight: 94.6 parts of polyethylene, 3 parts of ageing resistant agent, 1.2 parts of plasticizer and 1.2 parts of antioxidant.

As a further improvement of the invention, the impermeable layer is prepared from the following raw materials in parts by weight: 96.5 parts of PVDF, 1 part of plasticizer and 2.5 parts of heat stabilizer; the outer layer is prepared from the following raw materials in parts by weight: 98 parts of polyethylene, 1 part of an anti-aging agent and 1 part of a plasticizer; the outer protective layer is prepared from the following raw materials in parts by weight: 95.5 parts of polyethylene, 2.5 parts of ageing resistant agent, 1 part of plasticizer and 1 part of antioxidant.

As a further improvement of the invention, the impermeable layer is prepared from the following raw materials in parts by weight: 96.2 parts of PVDF, 1.05 parts of plasticizer and 2.75 parts of heat stabilizer; the outer layer is prepared from the following raw materials in parts by weight: 97.65 parts of polyethylene, 1.25 parts of anti-aging agent and 1.1 parts of plasticizer; the outer protective layer is prepared from the following raw materials in parts by weight: 95.05 parts of polyethylene, 2.75 parts of ageing resistant agent, 1.1 parts of plasticizer and 1.1 parts of antioxidant.

A process method of an environment-friendly anti-seepage flexible high-pressure delivery pipe for an oil and gas field comprises the following steps:

step one, three extruders share one set of die, the three extruders respectively extrude an impermeable layer, an adhesive layer and an outer layer, and an inner core layer of an integral structure is formed at a die opening through different flow channels in the die;

step two, adopting a vacuum box to fix the wall thickness and diameter of the inner core layer, wherein the vacuum pressure is-0.04 ~ -0.06 MPa;

step three, cooling the inner core layer by using a cooling water tank, wherein the temperature of the cooling water is 17 ~ 23 ℃;

step four, adopting a tractor to draw the inner core layer so as to ensure the continuous extrusion of the inner core layer;

winding the polyester fiber yarn outside the inner core layer by using a winding machine to form a winding layer, wherein the winding stroke is 2.2 times of the outer diameter of the inner core layer, and the winding tension is 6 kgf;

and step six, coating the outer protective layer on the outer surface of the winding layer through a coating machine.

As a further improvement of the invention, the inner core layer in the first step sequentially comprises an impermeable layer, an adhesive layer and an outer layer from inside to outside;

the impermeable layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 9 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 170 +/-3 ℃; and a second zone: 230 +/-3 ℃; and (3) three zones: 270 plus or minus 3 ℃; and (4) four areas: 290 +/-3 ℃; and a fifth zone: 300 +/-3 ℃; a sixth zone: 290 +/-3 ℃; seven areas: 290 +/-3 ℃; and eight regions: 280 plus or minus 3 ℃; nine areas: 260 +/-3 ℃;

the adhesive layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 80 plus or minus 2 ℃; and a second zone: 90 plus or minus 2 ℃; and (3) three zones: 105 +/-2 ℃; and (4) four areas: 110 +/-2 ℃; and a fifth zone: 100 plus or minus 2 ℃; a sixth zone: 95 +/-2 ℃;

the outer layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 160 +/-3 ℃; and a second zone: 175 plus or minus 3 ℃; and (3) three zones: 195 +/-3 ℃; and (4) four areas: 220 +/-3 ℃; and a fifth zone: 200 plus or minus 3 ℃; a sixth zone: 175 +/-3 ℃.

As a further improvement of the invention, the traction frequency of the traction machine in the fourth step is 45Hz, and the traction speed is 5 m/min.

As a further improvement of the present invention, the outer protective layer in the sixth step is formed by high-temperature melt extrusion, the extrusion temperature includes 6 temperature control zones, and the temperature of each temperature control zone is controlled at: a first area: 180 plus or minus 3 ℃; and a second zone: 190 plus or minus 3 ℃; and (3) three zones: 205 plus or minus 3 ℃; and (4) four areas: 235 plus or minus 3 ℃; and a fifth zone: 220 +/-3 ℃; a sixth zone: 185 +/-3 ℃.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the anti-seepage device is simple in structure, the anti-seepage layer is made of polyvinylidene fluoride with high density and good anti-seepage performance, a small amount of plasticizer and heat stabilizer are added, the permeation of media is effectively prevented, the soil is prevented from being polluted in the conveying process, and the use is prevented from being influenced due to the fact that the outer layer and the outer protection layer are corroded by the permeation of the media; the winding layer enhances the pressure resistance of the winding layer, and the outer protective layer is used for protecting the internal structure of the winding layer, so that the service life is long; by adopting a three-layer co-extrusion process, the anti-seepage layer, the adhesive layer and the outer layer can be integrally extruded, and the structure is more stable after the inner core layer is cooled by cooling temperature; the traction speed ensures the cooling effect of the inner core layer, so that the permeability of the product is greatly lower than that of the similar product; the winding tension is appropriate, so that the product has a better pressure resistance effect and better flexibility.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of the present invention.

Wherein: 1. a winding layer, 2, an outer protective layer, 3, an impermeable layer, 4, an adhesive layer, 5 and an outer layer.

Detailed Description

For purposes of clarity and a complete description of the present invention, and the like, in conjunction with the detailed description, it is to be understood that the terms "central," "vertical," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the present invention, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.